Finding the Third Proportional to 213,303 and 321,304.50

Step by Step Solution

1. Step 1: Write the proportion equation
   213,303 : 321,304.50 = 321,304.50 : x
2. Step 2: Convert to fraction form
   213,303/321,304.50 = 321,304.50/x
3. Step 3: Cross multiply
   213,303x = 321,304.50 × 321,304.50
4. Step 4: Simplify right side
   213,303x = 103,236,581,720.25
5. Step 5: Solve for x
   x = 103,236,581,720.25/213,303
6. Step 6: Final answer
   x = 483,990.29